Radial drill



D. c. KLAUSMEYER.

lRADIAL DRILL.

APPLICATION 'FILED AUG8, 1919.

v Patented Apr. 12,1921..

2 SHEETS-SHEET l- INVENTOR wlTNl-:ssEs:

' x e. im.

UNITED STATES PTENT oFFicE.

DAVID C. KLAUSMEYER, F CINCINNATI, OHIO, ASSIGNOR T0 THE CINCINNATIBICKFORD TOOL COMPANY, OF OAKLEY, CINCINNATI, OHIO, A CORPORA- TION 0FOHIO.

RADIAL DRILL.v

lSpecification of Letters Patent. Patented pl'. 12,- 1921"..

. Application led August 8, 1919. Serial No. 316,048.

T o all whom t ma, concern: K Be it known that ,DAVID C. KLAUSMEYER,

a citizen of the United States, and residing at Oakley, Cincinnati, inthe county of Hamilton and State of Ohio, have invented a new andImproved Radial Drill, of which the following specification is a fulldisclosure. t

This invention relates to power-driven drilling-machines and it dealslmore especially with the type known as radial drills which involve theuse of a column providing forthe elevation and depression of adrill-supporting arm radiating horizontally therefrom and, usually also,providing for a swing of said arm in. the horizontal plane; therebyaording a universal adjustment for the drill.

In such machines, by reason of the weight and length of the arm and ofthe weight of the head or the thrust Aof the drill, the

column is subjected to severe bending-loads and it is usually formed oftwo members, z'. e., the primary member, in the nature of an upstandingpost or trunk, and a secondary member, usually in the nature of 'asleeve or other mechanical element adaptedto serve as a pivotally actingelement to provide for the swing of the radial arm. n

.Mechanical considerations demand that this upright support, or column,post, or trunk,'as it may be termed, shall provide the requisite degreeof rigidity capable of adequately resisting the bending-stresses t'owhich it may -be subjected, and manufacturing, transporting and sellingconsiderations, require it to be constructed of the least amount ofmaterial consistent with the realization of sufiicient stiffness. In aneort to reconcile these conditions, manufacturers have resorted toasimple tubular or hollow Iformation, occasionally augmented withrudimentary ridges. l

The primary obj ect of this invention is to advance the development ofthis constructionv by more perfectly reconciling4 the above-namedconsiderations and thereby rendering available a post eminently suitablefor enteringinto a radial-drill organization as an element bettercordinating with the other `elements of the combination. Other objectswill be in part obvious from the annexed drawings and in part indie. ed

in connection therewith by the following analysis of the invention.

This invention accordingly consists in the features vof construction,combination of parts and in the unique relations of the members and inthe relative proportioning and disposition thereof; all as morecoinpletely outlined-herein.

To enable others skilled in the art so fully the numerous modificationsin structure' and relation contemplated by this invention,

drawings depicting a preferred form have.

been. annexed as a part of this disclosure, and insuch drawings, likecharacters of reference denote corresponding parts throughout all theviews, of which Y Figure l is a sectional elevation of a ratolcomprehend the underlying features l thereof that they ymay embody thesame by.

dial-drill embodying this invention. Fig. 2

is a horizontal section through line 2-2 of Fig: 1. Fig. 3 is lafragmentary vertical section through line 3+3 of Fig. 1. Fig. 4 is anelevation of the clamping device.

This invention is shown embodied-iny a radial-drill of the species inwhich the elevating screw 'is lpropelled through the agency of apower-driven shaft arranged coaxially with -the stationary,vupright postor trunk, although it will be understood that theY invention isapplicable to other types presenting somewhat different details ofconstruction. In the type herein illustrated,

. the post or trunk is indicated by A and it Aassumes the form of acasting bolted or otherwise mounted in unitary relationwith a baseindicated by Bin the form .of a suitable bolt receiving lugs located atits sides and i its rear; In this embodiment, the base portion providesapertured bosses 3 and 4 within which is journaled a driving shaft C ioobearing a beveled gear 5 adapted'to intermesh with the complementarybeveled gear 6 secured to an' upright driving .shaft D arranged, in thisinstance, so as to extend coaxially through the stationary post and tenminating exteriorly at its upper end in pro.- elling relation withsuitable change gears (which, in turn, are effective to rotate anelevating screw F located externally of the column and passing throughasuitable nut G secured to the arm H so as to enable the latter,together with the drill head I, to be elevated or depressed by the abovementioned power driven instrumentality.

At its upper end, the post lA is provided with an annular seat 7 adaptedto receive a bearing block 8 mounted concentrically and provided with anannular seat 9 adapted to receive an annular ball-bearing 10 and alsoprovided with a seat 11 adapted to support a thrust ball-bearing 12.Enveloping the above mentioned post, is a sleeve J in the nature of atube; said sleeve being secured at its upper end to a cap K which isprovided with a hub 13 adapted to bear against the thrust bearing`12,whereby the sleeve, together with the parts carried thereby may be hungfrom its upper end and have its weight in the whole or in part taken upby the aforesaid thrust bearing 12. This sleeve is provided with aninternal annular rib 14 concentricallylreceiving the side ball-bear# ing10 so that at its upper end, said sleeve will be free to rotate and tobe, at the same time, maintained truly concentric with the axis of thepost. Adjacent this lower end, said sleeve is also conformed torotatably bear against the post and, to that end, it is provided with anam le annular bearing surface 1 5 preferably flbrmed in the nature of aslight,annulvar ridge adapted to uni-.

formly contactjwitha corresponding surface 16 provided by the post..These bearingv por-` tion 15 and`16 are truly cylindrical so as topermit of the .slight axial adjustments in the position of the sleeveincidental to the assembly of the elements in the factory orsubsequently In order that the above mentioned sleeve may v be securelyclamped against rotation; during the drilling loperation,y its lowerportion isjslightly enlarged to telescope *with a brake surface 17provided by the lower portion of thepost. The sleeve is splithorizontally at 18 partially around its periphery and the portionthereby freed is split vertically at 19; thereby providing suicientresiliency or flexibility to admit of clamping. The clamp is, in thisinstance, formed of a draw-bolt 20 having its one end adjustably securedto a-lug 21 by means of suitable nuts and having its other end providedwith a perforated hub 22 apertured to receive an eccentric forming a',part of a stub shaft 23 journaled in lugs 24 and operated by a suitablehandle 25, as will be understood.

.The elevating screw F, above mentioned, is at its upper and lower endsjournaled in suitable bosses provided by the cap K and the lower portionof the sleeve, so as to be carried by the sleeve and spaced a suficientdistance therefrom so as to pass through the feed nut G provided by thearm H. The latter is provided with a portion 26 circumscribing thesleeves and internally having, annular bearing surfaces 27 and 28accurately fitting aroundthe sleeve J. The periphery 29 of the sleeve isground to true cylindrical form so that the arm may freely slide thereonand be given any desiredposition through the.

instrumentality of the feed screw F.

An analysis ofthe foregoing will show that the stationary element orpost A is subjected to very considerable bending strains in 'variousdirections depending upon the different positions both horizontally andvertically of the arm H. Great difficulty has been experienced in sodevising th structure of this post that thel aforesaid strains will beeffectively and invariably resisted. It will be at once apparent thatthe least yield will produce a corresponding displacement of the drillpoint and will correspondingly impair the precision of operation of themachine. Where a large sized drill is employed and fed rapidly into thework, as in the case of heavy duty drilling, it is obvious thatextremely heavyjbending strains will be imposed upon the post. Inaccordance with this invention, this post is accordingly given a.peculiar design which has been found to satisfy all requirements.

This post is vbi-tubular in structure with 'spaced vanes connecting thenested tubes.

Thus, an inner tubevA is located concentrically within the outer shellof the post and may extend froml near one end of the outer ablycontinuously as shown. ,Incase 1t is used 'for housinga driving shaft,it lmay terminate at about the point 30, somewhat above the shaft C, andmay berecessed to retain a bushing 31 for said shaft. It is-in this baseregion that the greatest strains occur, for here the post is subjectedtoits maximum bending-stresses-bythe arm, and. f here -it receives theclamping-strains that lock the sleeve against rotation, and .here italso carries pressures resulting from the power-transmitting elements.But, by reason of the integrally-vaned bi-tubular formation of thisbase-region, these various strains are taken-up or absorbed effectively-shell to near the other end thereof, preferv lll so that a highultimate accuracy and rigidity is achieved without employing an excequantity of cast-iron. Adjacent the upper end of the post, a portion ofthe inner tube A may terminate flush with the shoulder of the annularseat 7 or otherwise be adapted to assist in supporting the block 8. Inthickness, the wall of the inner tube may substantially approximate thatof the outer shell.

The vanes a, a', a? etc., are preferably cast to integrally connect theinner and outer tubes and will preferably be symmetrically arranged, asshown, so as to leave similar cells or spaces b, b', Z22, etc., arrangedin equispaced relation. These spaces .represent a very considerablesaving of metal Without materially sacrificing strength and stiffness.The vanes are shown to lie in radial planes but they may extend inhelical planes, and preferably they extend continuously between theextremities of the inner tube and may then divert at an angle from thelower end of the inner tube to meet the lower edge of the outer tube, asindicated by e and e; being cut away where necessary to make provisionfor the shaft C, and the gears 5 and 6. The wall thickness of theseveral vanes may be substantially equal to that of the tubes.

The advantageous rigidity of this structure will be recognized from theforegoing expos. It will also be appreciated that the inherentsimplicity of this design admits of its being cast as an integralstructure without any great difficulty being experienced with respect tothe molds or 1n the formation', placing, and subsequent removal of there uisite cores.

Vithout further elaboration, the foregoing will so fully reveal the gistofthis invention that others can by applying current knowledge readilyadapt it for various applications without omitting certain featuresthat, from the standpoint of the prior art, fairly constitute essentialcharacteristics of the generic or specific aspects of this invention,and therefore such adaptations should/ and are intended to becomprehended within the meaning and range of equivalency of thefollowing claims.

Having thus revealed this invention, I claim as new and desire to securethe following combinations of steps and elements, or equivalents thereofby Letters Patent of the United States. d

1. A radial drill combining a base; an arm extending horizontallytherewith; an upright post carried by said base and arranged to supportone end of said arm, `said post being formed of nested tubular portionsintegrally connected by .radial vanes; and means for effecting arelative adjustment between said arm and said base.

2. A radial drill combining a base; a bitubular post f upstandingtherefrom and formed of concentrically spaced tubular portionsintegrally connected by intervening vanes; an arm supported at one endby said post; and means for `vertically moving said arm.

3. A radial drill combining a base; a tubular post upstanding therefromconstituted of a plurality of co-axial tubular portions spacedperipherally apart, the outer portion witnesses.

extending continuously from top to bottom and having its lower endenlarged and integrally connected by a plurality of continuousintervening vanes with the; adjacent inner portion to form a basereinforced against bending strains; an arm extending radially to theaxis of said post; and means for effecting a relative verticaladjustment between `said base and said arm. 4. A radial drill combininga base; a bitubular post consisting of an outer and an inner tubularshell, said shells being continuous. and arranged co-axially, and beingintegrally connected by a plurality of vanes; an arm extending radiallyto the common axis of said shells;,and means for elevating said arm.

5. A radial drill combining a base; an upright post carried by said baseand arranged to support one end of said arm, said post being formed ofnested tubular portions integrally connected by radial vanes; a tubularsleeve rotatably carried by said post; an arm extending horizontallytherewith; and means for elevatingand lowering said arm.

6. A radial drill combining a base; a bitubular post upstandingtherefrom and formed of concentrically spaced tubular portionsintegrally connected by intervening vanes; a sleeve rotatably carried bysaid post; an arm radiating from said sleeve; and means'for verticallymoving said arm.

7 A radial drill combining a base; a bitubular post upstandingtherefrom. constituted of a plurality of co-axially arranged tubularportions, the outer portion extending continuously from top to bottomand having an enlarged lower end exteriorly providing a clamping surfaceinteriorly integrally connected by a plurality of continuous interveningvanes; a sleeve enveloping said post and having its lower end adapted tobe constricted, into a clamping relation with said clamping-surface; anarm extending radially from said sleeve; and means for vertically movingsaid arm.

8. A radial drill combining a base; a bitubular post consisting of anouter and an inner tubular shell, said shells being con-l tinuous andarranged co-axially, and being integrally connected by a plurality ofvanes; an elongated sleeve enveloping said post to rotate about the axisthereof; an arm extending radially to the common axis of said shells;and means for elevating said arm.

In witness whereof, I hereunto subscribe my name, as attested by the twosubscribing DAVID C. KLAUSMEYER. Witnesses SLETE,

AUG. H. TUEOHTER.

